examples/web-file-browser: Fix slurpUtf8Part.

This was calling in.read() twice.  The second time it would always be
-1, so the function would always return the empty string.

Author: Kannan Goundan

examples/web-file-browser/src/main/java/com/dropbox/core/examples/web_file_browser/DropboxBrowse.java

@@ -327,7 +327,7 @@ private static String slurpUtf8Part(HttpServletRequest request, HttpServletRespo
         InputStream in = part.getInputStream();
         int bytesRead = in.read(bytes);
 
-        if (in.read() == -1) {
+        if (bytesRead == -1) {
             return "";
         }